Question details

AC500 PLC PM573-ETH displaying e4004 error

We have 7 no.s PM573-eth plcs configured in a Modbus TCP/IP network with a couple of plcs having cm-574 modbus communication modules.

The application is in a pharma plant and there are around 180 modbus nodes catered across the PLCs and Communication modules.

The list of PLCs and their respective firmwares are tabulated below.

PLC No. PLC Firmware CM-574 Firmware

1. 1.4.1

2. 1.4.1

3. 1.3.2 2.3.0

4. 1.4.1

5. 1.3.2 2.2.0

6. 1.4.1

7. 1.4.1

Out of these the PLC1 and PLC2 are displaying E4004 error which says "No sockets are available". Earlier we have set the sockets to 8 but later as suggested by our local support engineer we have set it to 12 but still the error persits.

KIndly help us out of the situtaion immediately as we are struck in the fag end of the project.

There are no common IP addresses. We made sure on that aspect.
This started happening 3 days ago. Yesterday as per our support engineers advice we have changed the sockets to 12. It went well for a couple of hours but again the issue resumed.
Is there anything to do with the firmwares?

IMHO this fault is not depending of CPU FW, because probably you have the same FW and configuration also previously. What happened three days ago? Have you checked also the HW - cable, connectors and every module that they not have bad contacts?